I am trying to delay my movement in a game I'm creating. My problem is that every time that I use the int 1Ah the movement suddenly becomes "rusty" (not moving in a constant line) while my delay procedure where I use "nop" makes a solid movement and not rusty. My teacher says that I can't use a loop with "nop" and I don't know how to do a delay that uses 1Ah and looks fine (not rusty) I'm using graphics mode and assembly x86 Thanks. It works just fine, but my teacher probably won't like it for some reason.
my delay proc:
proc delay
delRep:
push cx
mov cx, 0FFFFH
delDec:
dec cx
jnz delDec
pop cx
dec cx
jnz delRep
ret
endp delay
This is another "delay" using int 15h with ah=86h, test it in your game :
;DELAY 500000 (7A120h).
delay proc
mov cx, 7 ;HIGH WORD.
mov dx, 0A120h ;LOW WORD.
mov ah, 86h ;WAIT.
int 15h
ret
delay endp
Another "delay" using system time, it should repeat about 5 times per second :
delay proc
system_time:
;GET SYSTEM TIME.
mov ah, 2ch
int 21h ;RETURN HUNDREDTHS IN DL.
;CHECK IF 20 HUNDREDTHS HAVE PASSED.
xor dh, dh ;MOVE HUNDREDTHS...
mov ax, dx ;...TO AX REGISTER.
mov bl, 20
div bl ;HUNDREDTHS / 20.
cmp ah, 0 ;REMAINDER.
jnz system_time
ret
delay endp
Next is the third delay in seconds, it requires one variable :
seconds db 0 ;◄■■ VARIABLE IN DATA SEGMENT.
delay proc
delaying:
;GET SYSTEM TIME.
mov ah, 2ch
int 21h ;◄■■ RETURN SECONDS IN DH.
;CHECK IF ONE SECOND HAS PASSED.
cmp dh, seconds ;◄■■ IF SECONDS ARE THE SAME...
je delaying ; ...WE ARE STILL IN THE SAME SECONDS.
mov seconds, dh ;◄■■ SECONDS CHANGED. PRESERVE NEW SECONDS.
ret
delay endp